using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;

namespace WPFTemplateLib.Extensions
{
	/// <summary>
	/// Class that provides extension methods to Collection
	/// </summary>
	public static class CollectionExtensions
	{
		/// <summary>
		/// Add a range of items to a collection.
		/// 拷贝自：Prism.Wpf 源码
		/// </summary>
		/// <typeparam name="T">Type of objects within the collection.</typeparam>
		/// <param name="collection">The collection to add items to.</param>
		/// <param name="items">The items to add to the collection.</param>
		/// <returns>The collection.</returns>
		/// <exception cref="ArgumentNullException">An <see cref="System.ArgumentNullException"/> is thrown if <paramref name="collection"/> or <paramref name="items"/> is <see langword="null"/>.</exception>
		public static Collection<T> AddRange<T>(this Collection<T> collection, IEnumerable<T> items)
		{
			if(collection == null)
				throw new ArgumentNullException(nameof(collection));
			if(items == null)
				throw new ArgumentNullException(nameof(items));

			foreach(var each in items)
			{
				collection.Add(each);
			}

			return collection;
		}
	}
}
